Question

I am trying this at the mongodb console:

db.foobar.update( 
  { name: "Foobar" },
  { 
    $set : { foo: { bar: 'bar' }, 
    $inc: { 'foo.count': 1 } 
  } 
}, true)

It returns with “ok”, but db.foobar.find(), returns an empty record set. I’m trying to upsert a document, so it looks like the:

name: Foobar
foo: {
  bar: 'bar'
  count: 1
}

If the doc doesn’t exist then create one with a count of 1. Otherwise, just increase the count. Why isn’t above working?

Answer 1

It seems to me that your code is actually trying to set the $inc field of the document rather than using the $inc modifier on the foo.count field. This might be what you want:

db.foobar.update(
    { name: "Foobar" }, 
    {
        $set: { 'foo.bar': 'bar' }, 
        $inc: { 'foo.count': 1 } 
    }, true)

Hope this helps.